With the info that you provided, do not try to shoot those cartridges. Either you have failed to resize the brass, used the wrong brass or wrong bullet.
Use 6.8 SPC brass and .277" (6.8mm ) diameter bullets.
Get a good reloading manual(s) and read it(them) through. Read and understand the instructions that came with your reloading dies and how to set them up before you load anything. Learn and understand the reloading process. Read everything you can in the reloading section in the forum.
Use 6.8 SPC brass and .277" (6.8mm ) diameter bullets.
Get a good reloading manual(s) and read it(them) through. Read and understand the instructions that came with your reloading dies and how to set them up before you load anything. Learn and understand the reloading process. Read everything you can in the reloading section in the forum.